[PATCH v2 0/3] Support --enable-newlib-reent-thread-local Newlib configuration option

[Chris Johns]

On 21/7/2022 6:21 pm, Sebastian Huber wrote:
> On 21.07.22 10:16, Chris Johns wrote:
>> On 21/7/2022 6:11 pm, Sebastian Huber wrote:
>>> On 21.07.22 10:03, Chris Johns wrote:
>>>> As an aside, does gdb know about TLS variables and so will `errno` be visible?
>>> Good question, there seems to be some support missing. For example for
>>> arm/xilinx_zynq_a9_qemu:
>>>
>>> Breakpoint 7, Init (ignored=2118804) at
>>> /home/EB/sebastian_h/src/rtems/testsuites/samples/fileio/init.c:1169
>>> 1169      TEST_BEGIN();
>>> (gdb) watch _tls_errno
>>> Cannot find thread-local variables on this target
>>> (gdb) p _tls_errno
>>> Cannot find thread-local variables on this target
>> I wonder if we need to configure gdb so it understands how we handle TLS
>> variables?
> 
> It could be a Qemu issue. In GDB there is a
> 
>       /* Check for the TLS register feature.  */
>       feature = tdesc_find_feature (tdesc, "org.gnu.gdb.arm.tls");
> 
> However, this is not provided by Qemu.

Is this something in the remote protocol? I would have thought the ABI would
define the register?

Chris